Features: Small and light, easy to use; Just insert this item into the car’s cigarette lighter and it will immediately start saving gasoline and money. Save 10~30% or more of gasoline. You can experience more horsepower, better acceleration, longer battery life and cleaner emissions. Save gasoline and save our planet. Specification: Color: black + blue Size: 4.3 x 1.18 x 0.78 inches Tips: 1. Due to manual measurement, please allow slight measurement deviation; 2. The color of the product may be different due to the difference of the display and the light, please refer to the actual product. 3. If you have any questions about our products, please contact us in time, we will try our best to solve the problem within 24 hours to ensure that you have a 100% satisfactory shopping experience!